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Note 17 - Other Postretirement Benefits (Details) - Weighted-average Assumed Healthcare Cost Trend Rates Used to Compute Other Post-retirement Amounts - Other Postretirement Benefit Plans [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Note 17 - Other Postretirement Benefits (Details) - Weighted-average Assumed Healthcare Cost Trend Rates Used to Compute Other Post-retirement Amounts [Line Items]    
Healthcare cost trend 5.81% 6.47%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.21% 4.65%
Year that the rate reaches the ultimate trend rate 2022 2021